Cutter-head.



A. B. L'ANDIS.

CUTTER HEAD.

APPLICATION FILED DBO. 22, 1909.

I Patented Feb. 20, 1912. 2 SHEETS-SHEET 1.

' A. B. LANDIS'.

CUTTER HEAD.

APPLICATION FILED DEC. 22, 1909.

Patented Feb. 20, 1912.

2 SHEETS-SHBET 2.

, m M Q L J Q m 2 MM WY E w .6:

fVVE/VTOR. m

A TORNEY in a rigid manner and easily and conveniently released and ad usted, all as Wlll be AERMAM B. LANDIS, F 'WA'E'NESIBORQ, PENNSYLVANIA. I

GUTTEE'IHEAD.

- Specification of Letters Patent."

Patented Feb. 20, 1912.

application filed December 2Q, 1909; Serial No. 534,542.

.Zb cZZ whom it may concern."

lie it known that 1,;ABRAHAM B. LANDIS, e citizen of the United States, residing at Waynesboro, in the county of Franklin and era-n. of, Pennsylvania, have invented cer- "ta-in new and useful Improvements in Gutrer- Heads, of which the following is a specin @311.

said invention relating principally to the eans for securing the cutter in the cutterholder, wl'iereby said cutter may be. secured hereinafter described claimed. 1

Referring to the accompanying drawings which are madea part hereof and on which more fully and similar reference characters indicate similar parts, Figure 1 is a front elevation of the cutter-head embodying my said improve ment, Fig 2a view partly in side elevation and partly in longitudinal section as on the ifhe body or frame A is, or may be, of

any approved construction preferably of the fiormmore fully illustrated and described inymy application No. 529,152, filed Novembcrifid. 3.509.. It is formed with the bearfor the cutter-holders located equidistw. around a central aperture and is adapted to be secured on the end of the spindle of the machine in any. approved manner. It is provided with a part A surrounding the body and adapted to have a limited ion ,itudinal movement thereon between whio and the outer ends of the out willy said invention consists in various imin 'sprovements in the details of construction land arrangement of parts of cutter-heads ;;;for. cutting threads on bolts, screws, etc,

- said cutter.

tor-holders are interposed suitable toggle pins 0;.

The construction in operation of the adjusting mechanism for-regulating the size ofthe die and for opening and closing the die may be the same as shown and described in my above named application, or of any other construction found appropriate.

The cutter-holders B are each of the form best shown in Figs. 3, 4 and 5 and consist of a trunnion adapted to be mounted in one of the bearings provided therefor in the body A, said trunnion carrying on its forward end a part- B' which projects to one side of the axis of said trunnion and is formed with a recessed face to receive the cutter. It is also formed with a bearing 6 for the inner end of the toggle pin a.

The cutters G are each a block of steel of appropriate dimensions having cutting grooves extending longitudinally in their faces and are formed to rest in the recess formed in the cutter-holder provided therefor. Said recess is formed as best shown in Fig. l with a shoulder near its outer edge, preferably, of a right-angular formation, or, as shown in Fig. 6, with an'inwardly projecting flange against which the outer edge of the cutter may rest. In the form shown in Fig. l the cutter Cis formed with a recess in its outer back corner adapted to fitover the corner of the shoulder formed at the outer edge of the recess in the holder. The inner edge oft-lie cutter is formed tapered at a point adjacent to the thread cutting grooves. A clamping bolt or plunger'lO is mounted in a socket, or perforation, in the part B of the holder adja-- cent to and adapted toengage with the inner edge of said cutter, its lower end being .formed with a tapered face 11 adapted to impinge againstthe tapered inner edge of the part B on the outer end of which is mounted a nut, or plate, 13. A plate, or washer, 14 is mounted on a shoulder formed near the outer end of the socket in which the plunger is operated, and a springlo is interposed between said plate 14 and the plate 13, on the outer end ofvsaid shank, the

Said boltis formed with a. shank 12 projecting fora distance beyond tension of said spring being directed against said plate 13 andtending to force the bolt outwardly with its tapered face'll against the tapered inner edge of the cutter, thus clamping said cutter firmly between said tapered edge and the angular engagement with the recess in tli holder at the outer back corner. In the construction shown in Fig. 6- the clamping engagement would be between the clamping bolt 10 and the flange 1) on the outer face of the cutter-holder.

Screw-threads are formed in a groove on the back of the cutterC and a screw is mounted in a longitudinal perforation in the part B and adapted to engage therewith for holding and adjusting said cutter longitudinally. Said screw 20 has a thumb nut 21 on its outer end by which it may be operated. A rocking cylinder 22 is mounted in a perforationalongside plunger 10 and v fhas a radially projecting tongue or rib 23 .which engages with a notch 24 in the side of said plunger. A lever 25 is mounted in the outer end of said'cylinder and serves as a means for operating thesame to force the plunger outwardly'to loosen up. the engage ment between the parts when the screw 2C may be turned to adjust the cutter, or the cutter may be removed and replaced,

tion.

It will be seen that a construction is thus provided which will secure the cutter in place in a very secure manner and at the same time be automatic in its action while permitting a yery convenient adjustmentof the parts and at the same time a constructron 1s provided which 1s comparatively inexpensive as well as most eliiclent 1n operation 7 and results Under the rules of practice a cross reference is made -to my eo-pendin'g application No.,534,542 relating to analogous subject matter.

Having thus fully described my said invention, what I claim as neiv, and desire to set fort-h.v 2., A cutter-head comprising a holder formed with a recess to'receive the cutter, a

' cutter mounted in said recess with its outer edge resting. against a shoulder at the outer The operationofmy said invention will be understood from the foregoing descrip-,-

a tapered edge adjacent to the cutting grooves, a spring mounted clamping member mounted in a socket adjacent to the inner-edge of said cutter and formed with a tapered face adapted to engage with the tapered edge of said cutter, means for operating saidclamping member against the action of said spring, and means for holding said cutter longitudinally, substantially as set forth.

3. A cutter-head comprising a cutterholder formed with a recess to receive the cutter said recess being formed at its outer edge with a bearing face for the outer edge of the cutter to rest against, said cutter mounted in said recess and formed with a tapered corner on its inner edge adjacent to its face, a clamping member mounted to slide ,in a socket, adjacent to said inner edge and formed with a tapered face arranged to engage with said tapered corner, means. for normally forcing said clamping member into engagement with said tapered corner,

means for disengaging said clamping mem-' her, and means for holding said cutter longitudinally, substantially as set forth.

4;. A cutter-head comprising a cutter holder formed to receive and support the cutter, a clamp for securing the cutter in.

said holder comprising a spring mountedplunger. with a tapered face and arranged to engage one corner of said cutter and clamp the same against a fixed support at its oppo site edge, substantially as set forth.

5. A cutter-head comprising a cutter-- holder formed to receive and support the cutter, a cutter mounted therein with oneedge resting against a fixed support or jaw in said holder and a movable clamping member with a tapered face arranged to en gage with the opposite edge of said cutter and clamp it against said fixed support, sulr stantially as set forth.

6. A cutter-head comprising a cutterliolder formed to receive the cutter and pro vided with. a fixed ltSi] or jaw to support the back outside corner thereof, a cutter mounted in said holder against said support or jaw-and a movable clamp with in. tapered clamping face mounted in said holder and arranged to bear against the inner front corner of said cutter and force it against said fixedsupport, substantially as set forth.

7 A cutter-head comprising a cutter- .holder formed with a recess to receive and support the cutter, a fixed support or jaw at the .outer edge ,of said. recess, the cutter mounted to rest'against said fixed support: at its.outer edge formed with a tapered cor-- ner' adjacent to its face on its inner edge, a spring mounted clamping member formed with a tapered face and arranged to bear against said tapered corner, a rocking cyledge of said recess, said cutter formed with j -inder with a radially projecting tongue cugaging with a notch in the side of said of Columbia this 17th day of Decemhe clamping member for operating the same A. D. nineteen hundred and nine.

against the action of said spring and means for holding the same longitudinally, sub- ABRAHAM LAN P5 1 5 stantially as set forth. Witnesses:

In Witness whereof, I, have hereunto set E. W. BRADFORD, my hand and seal at Washington, District L. A. PRICE. 

